A recent study by researchers from the University of Oxford, Durham University, and the University of Toronto has outlined the geological components necessary for discovering natural sources of clean hydrogen. The findings, published in Nature Reviews Earth & Environment, present a breakthrough in addressing the challenge of hydrogen supply. With hydrogen being a crucial component for various sectors such as food production and energy transition, the demand for hydrogen is projected to skyrocket in the coming years. To meet this demand sustainably and prevent CO2 emissions, it is essential to shift towards natural sources of hydrogen. The study reveals that over the last billion years, the Earth's continental crust has produced enough hydrogen gas to fulfill mankind's energy needs for at least 170,000 years. Despite some loss and inaccessibility, the remaining hydrogen reserves provide a promising emission-free energy source. By developing an exploration strategy, researchers aim to identify viable accumulations of natural geological hydrogen. The research emphasizes the importance of understanding hydrogen production, migration, and preservation mechanisms within the crust. Additionally, it sheds light on the need to avoid microbial consumption of hydrogen to maintain economic accumulations. Professor Chris Ballentine, the lead author, compares the process of finding accumulated hydrogen to cooking a soufflé – precise combinations are necessary for success. The study dismisses speculations about hydrogen sources from the Earth's mantle and focuses on feasible sources within the crust. Snowfox Discovery Ltd., a company established by the authors, is dedicated to exploring and leveraging these natural hydrogen reservoirs. By unlocking a repeatable exploration recipe, the discovery of commercially competitive, low-carbon hydrogen sources could significantly impact the global energy transition.